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Histopathologic criteria for diagnosis of lymphocytic colitis and collagenous colitis
| Histopathologic criteria | |
| Lymphocytic colitis | Chronic inflammatory infiltration in lamina propria |
| Increased IELs | |
| Superficial epithelial degeneration and increased mitosis in crypts | |
| IELs/100 intercryptal epithelial cell > 20/100 | |
| Collagenous colitis | A diffusely distributed and thickened sube-pithelial collagen band > 10 μm |
| Chronic inflammatory infiltration in lamina propria |
